Finding the Fourth Proportional to 2,039.40, 3,057.72 and 806.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,039.40 : 3,057.72 = 806.47 : x
2. Step 2: Convert to fraction form
   2,039.40/3,057.72 = 806.47/x
3. Step 3: Cross multiply
   2,039.40x = 3,057.72 × 806.47
4. Step 4: Simplify right side
   2,039.40x = 2,465,959.45
5. Step 5: Solve for x
   x = 2,465,959.45/2,039.40
6. Step 6: Final answer
   x = 1,209.16